Wormfang Manta 
Creature — Nightmare Fish Beast
$0.48 #23106 0.32 24.4 years
Flying
When this creature enters, you skip your next turn.
When this creature leaves the battlefield, you take an extra turn after this one.
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Cards similar to Wormfang Manta expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Eater of Days84%
$0.96↑#11940↑1.06↑22.7 years↓
"When this creature enters, you skip your next two turns."
Magosi, the Waterveil78%
$1.04↑#13872↑0.51↑17.0 years↓
", 
: Put an eon counter on this land. Skip your next turn."
, : Put an eon counter on this land. Skip your next turn."
Capture of Jingzhou74%
$7.33↑#5173↑1.27↑27.5 years↑
"Take an extra turn after this one."
Temporal Manipulation74%
$4.93↑#3124↑1.44↑28.3 years↑
"Take an extra turn after this one."
Watcher for Tomorrow70%
$0.18↓#7578↑0.06↓7.4 years↓
"When this creature leaves the battlefield, put the exiled card into its owner's hand."